SpaceX is expected to conduct a hold-down firing Thursday of a previously-flown Falcon 9 rocket booster at Cape Canaveral, ahead of a scheduled May 31 liftoff with an all-electric commercial communications satellite for SES.

Closing out a three-day chase from a launch pad in Virginia, Orbital ATK’s Cygnus cargo freighter arrived Thursday at the International Space Station with nearly 7,400 pounds of equipment, delivering food, a quantum physics experiment, and CubeSats for later deployment in orbit.

Engineers are studying a malfunction with the main imaging instrument on NOAA’s GOES-17 weather satellite, launched March 1, that could limit the observatory’s ability to monitor storms, winds and other weather phenomena at night, officials said Wednesday.

A SpaceX Falcon 9 rocket powered by a reused first stage climbed into orbit Tuesday from California’s Central Coast, carrying five satellites to upgrade Iridium’s global messaging service and two research craft to study Earth’s water cycle.

SpaceX’s tenth launch of the year took off Tuesday from California’s Central Coast on a unique ridehsare mission to add satellites to Iridium’s communications network and replace two Earth science satellites which ended their observations last year.

A pair of European-built, NASA-backed research satellites set for launch Tuesday from California will extend 15 years of global gravity field measurements collected by the GRACE mission before it ended last year, supplying scientists with data to help track the melting of Earth’s ice sheets and chart the impacts of floods and droughts.

SpaceX’s Falcon 9 rocket rolled out to its launch pad at Vandenberg Air Force Base, California, on Monday, one day before its scheduled liftoff carrying seven satellites into orbit on commercial communications and climate research missions.